ELECTRICAL MEASUREMENT AND INSTRUMENTS 2022 Question Paper — Governme…
The 2022 ELECTRICAL MEASUREMENT AND INSTRUMENTS previous year question paper (Government College of Engineering and Technology, Jammu), with every question and its marks.
- University: Government College of Engineering and Technology, Jammu
- Subject: ELECTRICAL MEASUREMENT AND INSTRUMENTS
- Course: Electrical Measurement & Instrumentation
- Branch: ELECTRICAL ENGINEERING
- Year: 2022
- Paper: end-term
- Duration: 180 minutes
- Total marks: 100
Instructions
- Attempt five questions in all selecting at least two questions from each Section.
- Each question carries 20 marks.
- Use of calculator is allowed.
Questions
Section-A
- Q1. a) Explain different types of errors in measurement by giving suitable example. (10) b) Explain the following terms 1. Accuracy 2. Calibration 3. Resolution 4. Precision 5. Selectivity (10) [20 marks]
- Q2. a) What are the different methods used for Damping in measuring instruments? Also list their advantage and disadvantage? (15) b) What is the need of the controlling torque in the measuring instruments? (5) [20 marks]
- Q3. Explain the construction and working of Current transformer. Also draw its equivalent circuit and phasor diagram. (20) [20 marks]
- Q4. Describe the constructional details and working of an electrodynamometer type instruments. Derive the equation for deflection under a.c. operation if the meter is spring controlled. (20) [20 marks]
Section-B
- Q5. a) Explain the Wheat Stone Bridge used for measuring medium resistance. Also find the sensitivity of Wheat Stone Bridge. (12) b) Explain the loss of charge method for measurement of insulation resistance of cable. (8) [20 marks]
- Q6. a) How wattmeter is used in single-phase AC circuits for the measurement of power? (10) b) What are the common errors in wattmeter? (10) [20 marks]
- Q7. a) The arm of a four arm bridge a,b,c and d supplied with sinusoidal voltage have the following values: Arm ab: resistance of 500 ohm with a parallel capacitor of $2\mu\text{F}$ Arm bc: 400 ohm resistance Arm cd: 1kilo ohm resistance Arm da: A resistance R2 in series with $2\mu\text{F}$ capacitance. Determine the value of R2 and frequency at which the bridge is balance (10) b) Which bridge is used for the measurement of the frequency? Derive the balance equation. (10) [20 marks]
- Q8. a) Draw the circuit diagram of a Crompton's potentiometer and explain its working. Describe the steps used when measuring an unknown resistance. (15) b) Describe the basic principle of a D.C. Potentiometer. (5) [20 marks]